A spit curl is a spiral curl of hair pressed flat against the cheek, temple, or forehead, a style popular in the 1920s and made famous by actress Clara Bow and cartoon character Betty Boop.
The unglamorous name for spit curls suggests how they stayed locked on the head. Normally women would set small tendrils in the front of their hair with bobby pins, and then would position them by licking or wetting their fingers to produce the spit curls look.
The Daily Omnivore 
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